<?php
 

/**
 * RSS生成类
 * @author    zts1993 <admin@zts1993.com>
 * @version   1.0
 */

class RSS

{

    /**

     +----------------------------------------------------------

     * RSS频道名

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $channel_title = '';

    /**

     +----------------------------------------------------------

     * RSS频道链接

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $channel_link = '';

    /**

     +----------------------------------------------------------

     * RSS频道描述

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $channel_description = '';

    /**

     +----------------------------------------------------------

     * RSS频道使用的小图标的URL

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $channel_imgurl = '';

    /**

     +----------------------------------------------------------

     * RSS频道所使用的语言

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $language = 'zh_CN';

    /**

     +----------------------------------------------------------

     * RSS文档创建日期，默认为今天

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $pubDate = '';

    protected $lastBuildDate = '';

 

    protected $generator = 'ZTS RSS Generator';

 

    /**

     +----------------------------------------------------------

     * RSS单条信息的数组

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $items = array();

 

    /**

     +----------------------------------------------------------

     * 构造函数

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @param string $title  RSS频道名

     * @param string $link  RSS频道链接

     * @param string $description  RSS频道描述

     * @param string $imgurl  RSS频道图标

     +----------------------------------------------------------

     */

    public function __construct($title, $link, $description, $imgurl = '')

    {

        $this->channel_title = $title;

        $this->channel_link = $link;

        $this->channel_description = $description;

        $this->channel_imgurl = $imgurl;

        $this->pubDate = Date('Y-m-d H:i:s', time());

        $this->lastBuildDate = Date('Y-m-d H:i:s', time());

    }

 

    /**

     +----------------------------------------------------------

     * 设置私有变量

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @param string $key  变量名

     * @param string $value  变量的值

     +----------------------------------------------------------

     */

     public function Config($key,$value)

     {

        $this->{$key} = $value;

     }

 

    /**

     +----------------------------------------------------------

     * 添加RSS项

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @param string $title  日志的标题

     * @param string $link  日志的链接

     * @param string $description  日志的摘要

     * @param string $pubDate  日志的发布日期

     +----------------------------------------------------------

     */

     function AddItem($title, $link, $description, $pubDate)

     {

        $this->items[] = array('title' => $title, 'link' => $link, 'description' => $description, 'pubDate' => $pubDate);

     }

 

     /**

     +----------------------------------------------------------

     * 输出RSS的XML为字符串

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @return string

     +----------------------------------------------------------

     */

    public function Fetch()

    {

        $rss = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\r\n";

        $rss = "<rss version=\"2.0\">\r\n";

        $rss .= "<channel>\r\n";

        $rss .= "<title><![CDATA[{$this->channel_title}]]></title>\r\n";

        $rss .= "<description><![CDATA[{$this->channel_description}]]></description>\r\n";

        $rss .= "<link>{$this->channel_link}</link>\r\n";

        $rss .= "<language>{$this->language}</language>\r\n";

 

        if (!empty($this->pubDate))

            $rss .= "<pubDate>{$this->pubDate}</pubDate>\r\n";

        if (!empty($this->lastBuildDate))

            $rss .= "<lastBuildDate>{$this->lastBuildDate}</lastBuildDate>\r\n";

        if (!empty($this->generator))

            $rss .= "<generator>{$this->generator}</generator>\r\n";

 

        $rss .= "<ttl>5</ttl>\r\n";

 

        if (!empty($this->channel_imgurl)) {

            $rss .= "<image>\r\n";

            $rss .= "<title><![CDATA[{$this->channel_title}]]></title>\r\n";

            $rss .= "<link>{$this->channel_link}</link>\r\n";

            $rss .= "<url>{$this->channel_imgurl}</url>\r\n";

            $rss .= "</image>\r\n";

        }

 

        for ($i = 0; $i < count($this->items); $i++) {

            $rss .= "<item>\r\n";

            $rss .= "<title><![CDATA[{$this->items[$i]['title']}]]></title>\r\n";

            $rss .= "<link>{$this->items[$i]['link']}</link>\r\n";

            $rss .= "<description><![CDATA[{$this->items[$i]['description']}]]></description>\r\n";

            $rss .= "<pubDate>{$this->items[$i]['pubDate']}</pubDate>\r\n";

            $rss .= "</item>\r\n";

        }

 

        $rss .= "</channel>\r\n</rss>";

        return $rss;

    }

 

    /**

     +----------------------------------------------------------

     * 输出RSS的XML到浏览器

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @return void

     +----------------------------------------------------------

     */

    public function Display()

    {

        header("Content-Type: text/xml; charset=utf-8");

        echo $this->Fetch();

        exit;

    }

}

?>
